« Home « Kết quả tìm kiếm

Sodium borohydride

Tìm thấy 17+ kết quả cho từ khóa "Sodium borohydride"

Preparation of different thin film catalysts by direct current magnetron sputtering for hydrogen generation

tailieu.vn

Fiber-shaped Co modified with Au and Pt crystallites for enhanced hydrogen generation from sodium borohydride. 10.1016/j.ijhydene . Efficient hydrolysis of alkaline sodium borohydride catalyzed by cobalt nanoparticles supported on three–dimensional graphene oxide. doi: 10.1016/j.materresbull . Synthesis of MOF-derived Co@C composites and application for efficient hydrolysis of sodium borohydride. doi: 10.1016/j.apsusc . Hydrogen generation with sodium borohydride solution by Ru catalyst.

Spectrophotometric analysis of stability of gold nanoparticles during catalytic reduction of 4-nitrophenol

tailieu.vn

SPR stability of GNPs during catalytic reduction of 4-NP at different sodium borohydride concentrations: 10 µM (A), 15 µM (B), and 20 µM (C). A clear blue shift is seen in the cases of 15 and 20 µM concentrations.. Control experiment for 4-NP reduction with borohydride in the presence and absence of GNPs at room temperature.. Silver nanoparticle catalyzed reduction of aromatic nitro compounds.

Khử hoá một số dẫn chất 1-(3-Nitrophenyl)-1h-Pyrazol-5(4h)-On và khảo sát hoạt tính kháng khuẩn, kháng nấm

tailieu.vn

Method: The 4-benzyl-3-methyl-1-(3-nitrophenyl)-1H-pyrazol-5-ol derivatives were synthesized through the reduction reaction of 4-benzylidene-3-methyl-1-(3-nitrophenyl)-1H-pyrazol-5(4H)-on with sodium borohydride. Results: 14 derivatives of 4-benzyl-3-methyl-1-(3-nitrophenyl)-1H-pyrazol-5-ol were synthesized by the reduction reaction with sodium borohydride with the yield of this step ranging 75-85%.

Wool-coiled bimetallic oxysulfide MoSrOS catalyst synthesis for catalytic reduction of toxic organic pollutants and heavy metal ions

tailieu.vn

Reduction of Cr(VI). 8c indicates the reduction of a potassium dichromate solution with the simultaneous addition of MoSrOS-2 and sodium borohydride. 8d also shows the reduction of potas- sium dichromate in the presence of sodium borohydride by cata- lysts with different amounts of strontium. MoSrOS-3 (0.0545 min 1 ) >. MoSrOS-4 (0.0236 min 1 ) >. MoSrOS-1 (0.0145 min 1.

Bài báo khoa học

www.scribd.com

Quá trình đượ c th ự c hi ệ n b ằ ng ph ả n ứ ng kh ử CuCl 2 trong dung môi nướ c, ch ấ t kh ử là sodium borohydride (NaBH 4 ) có s ự hi ệ n di ệ n c ủ a ch ấ t ho ạ t độ ng b ề m ặ t cetyl trimethylammonium bromide (CTAB. Phương pháp này có ưu điể m là ph ả n ứ ng di ễ n ra nhanh, d ễ th ự c hi ệ n, d ễ dàng điề u ch ỉnh kích thướ c và hình d ạ ng c ủ a h ạ t nano đồ ng .

Portable Devices: Fuel Cells

tailieu.vn

Micro reformed hydrogen fuel cell (mRHFC) refers to a small proton exchange membrane fuel cell (PEMFC) in addition to an on-board hydrogen supply system to the fuel cell either from hydrocarbon reforming or from a chemical hydride (such as sodium borohydride). Micro reformed hydrogen fuel cell can be divided into two categories based on the operating temperature of the reformer.

HoaHuuCo 2 Chuong 17

www.scribd.com

ALCOHOL TỪ SỰ HOÀN NGUYÊN HỢPCHẤT CARBONYLAldehydeKetone Hợp chất AlcoholCarboxylic acid carbonylEster Tác nhân hoàn nguyên: Sodium borohydride (NaBH4. Hoàn nguyên aldehyde và ketone 2930Tác nhân hoàn nguyên: Lithium aluminum hydride (LiAlH4.

Catalytic application of 1,3,5-triazine-pentaethylenehexamine polymer-supported palladium nanoparticles in the convenient reduction of nitroarenes with sodium borohydride or hydrazine

tailieu.vn

Catalytic application of 1,3,5-triazine-pentaethylenehexamine polymer-supported palladium nanoparticles in the convenient reduction of nitroarenes with sodium. Abstract: The catalytic activity of 1,3,5-triazine-pentaethylenehexamine (TAPEHA) polymer-supported Pd nanoparti- cles was investigated in the reduction of nitro arenes to the corresponding amines by NaBH 4 or N 2 H 4 .H 2 O.

Hydrolysis of ammonia borane and hydrazine borane by poly(N -vinyl-2-pyrrolidone)-stabilized CoPd nanoparticles for chemical hydrogen storage

tailieu.vn

The catalyst is prepared by simultaneous reduction of suitable cobalt and palladium ions by sodium borohydride in the presence of poly( N -vinyl-2-pyrrolidone) as a stabilizer. They provide average turnover frequencies of 30 min − 1 and 45 min − 1 in the hydrolysis of ammonia borane and hydrazine borane.

Biochemistry, 4th Edition P113

tailieu.vn

The trans- aldolase reaction of the pentose phosphate pathway involves this type of active-site intermediate and would be expected to be in- hibited by sodium borohydride.. Glycogen molecules do not have any free reducing ends, regardless of the size of the molecule. If branching occurs every 8 residues and each arm of the branch has 8 residues (or 16 per branch point), a glycogen molecule with 8000 residues would have about 500 ends.

Facile fabrication of nano zerovalent iron – Reduced graphene oxide composites for nitrate reduction in water

tailieu.vn

Synthesis of rGO-nZVI composites. rGO-nZVI composites under facile conditions were synthesised using BH 4 − or green tea derived polyphenols. the synthesis of rGO-nZVI-B, a 50 mL of 1 M sodium borohydride solu- tion was added dropwise to rGO and FeSO 4 .7H 2 O suspension stirred for 24 h. Alternatively, for the preparation of rGO-nZVI-P, 200 mL polyphe- nol extract was added to the rGO/FeSO 4 .7H 2 O suspension and stirred for 24 h.

TỔNG HỢP VÀ ĐÁNH GIÁ SỰ HẤP DẪN NGOÀI ĐỒNG CỦA PHEROMONE GIỚI TÍNH SÙNG KHOAI LANG, CYLAS FORMICARIUS FAB.

ctujsvn.ctu.edu.vn

Điều này làm cho con đường tổng hợp của Mithran and Subbaraman (1999) phải tăng thêm công đoạn khử Z3-12:Ald bằng Sodium borohydride để thu hợp chất Z3-12:OH, như vậy chi phí và thời gian gia tăng, trong khi năng suất tổng hợp của quy trình giảm.. Phản ứng Wittig có ưu điểm là khắc phục được việc sử dụng các tác nhân gây ung thư, trong khi điều kiện phản ứng đơn giản, dễ thực hiện với chất phản ứng rẻ tiền (so với phản ứng bắt cặp).

BAN MAU CO CHE PHAN UNG 2

www.scribd.com

5) Trichloroethanol có thể được tổng hợp bằng phản ứng khử trực tiếp chloral hydrate trong nước với sodium borohydride. Đề xuất cơ chế cho phản ứng này. Chú ý rằng sodium borohydride không thay thế hydroxide từ các nguyên tử carbon.6) Không thể tạo ra các sản phẩm cộng từ các aldehyde đơn giản và HCl. Nếu có thể được tạo ra thì cấu trúc của những sản phẩm đó là như thế nào? Trình bày cơ chế tạo thành và giải thích tại sao không thể điều chế những chất này?

The synthesis of 1,3-dialkyl-4-methylimidazolinium salts and their application in palladium catalyzed Heck coupling reactions

tailieu.vn

The condensation reaction of 1,2-diaminopropane with two molar equivalents of the aromatic aldehydes in ethanol gave the corresponding Schiff bases 1, which were subsequently treated with sodium borohydride in methanol at room temperature to produce the corresponding benzylic diamines 2. The salts are soluble in the common polar solvents and are air- and moisture-stable both in the solid state and in solution.

Tổng quan về tình hình nghiên cứu

www.scribd.com

Kết quả tạo ra các hạt nano vàng có kích thước khoảng 15 nm. [38]Quy trình Chitosan: CHIT có thể xem như là tác nhân khử, vừa là tác nhân ổn định.Kết quả tạo được các hạt nano vàng có kích thước cỡ 30 nm nm [4].Phương pháp polyelectrolyte gián tiếp, không micell: sử dụng các tác nhân Poly –allylamine hydrochloride (PAH) và poly – styren sulfonat (PSS), sodium borohydride(NaBH4) và tri – sodium citrate dihydrate (Na3C6H5O7.2H2O), cho hạt có kích thướccỡ 4 nm [19].Phương pháp dung môi hữa cơ an toàn

Preparation and catalytic evaluation of Au/γ-Al2O3 nanoparticles for the conversion of 4-nitrophenol to 4-aminophenol by spectrophotometric method

tailieu.vn

Supported catalyst presented excellent catalytic ability to convert 4NP to 4AP in the presence of sodium borohydride (SBH) due to synergistic effect of Au NPs and mesoporous γ -Al 2 O 3 support. The development of highly stable Au/ γ -Al 2 O 3 catalysts with lowest noble metal content and recyclability made the process cost effective and may promote their applications in various fields including removal of organic pollutants in industrial waste water and high-temperature gas-phase reactions..

Aviation: Fuel Cells

tailieu.vn

Its monopolar fuel cell system con- sumed hydrogen from a sodium borohydride reaction vessel. a number of researchers and commercial entities have developed fuel cell-powered UAVs with increasing size and scale, as shown in Figure 3. To date, most small- scale UAV power plant systems have been designed with PEM fuel cell systems, which are self-humidified or passively humidified, unhybridized, and with compressed or chemical hydride hydrogen storage.

Sodium borohydride for the near-future energy: A “rough diamond” for Turkey

tailieu.vn

This is a way to tailor the thermodynamic proper- ties of the borohydride compounds.

Anion-Exchange Membranes

tailieu.vn

Sodium Borohydride Fuel Cells. Fuel Cells – Overview: Introduction. Fuel Cells – Proton-Exchange Membrane Fuel Cells:. History: Fuel Cells.. Kim JR, Cheng S, Oh S–E, and Logan BE (2007) Power generation using different cation, anion, and ultrafiltration membranes in microbial fuel cells. Lu S, Pan J, Huang A, Zhuang L, and Lu J (2008) Alkaline polymer electrolyte fuel cells completely free from noble metal catalysts..

Iron nanoparticles on growth and acclimatization of Chrysanthemum morifolium Ramat. cv. "Jimba" in different culture systems

tailieu.vn

Sodium borohydride was used as a reducing agent and carboxymethyl cellulose as a stabilizer (Chau et al., 2008).. Effect of FeNPs on the growth of Chrysanthemum in culture systems. Chrysanthemum shoots (2.0 cm) with 2 pairs of leaves were cultured on modified MS medium that removed Fe-EDTA, and added different concentrations of FeNPs and 200 mM corresponds to Fe0, Fe¼, Fe½, Fe¾, Fe1 and Fe2). MS medium with 100 mM FeSO 4 .7H 2 O (FeMS) was used as the control..