12054-72-7Relevant articles and documents
Sulfamic: acid incorporated tin oxide: Acidity and activity relationship
Abo El-Yazeed,Eladl,Ahmed, Awad I.,Ibrahim, Amr Awad
, (2021)
Herein we study the activity and acidity relationship, Sulfamic acid (SA) has been incorporated with tin oxide (Sn). Acidity measurement confirmed the presence of dual-acidic sites. SA hinders the crystallization and inhibits SnO2 crystal growth. The particle size of SnO2 (2.1–8.2 nm) and the SBET values of samples were found to be dependent on the SA content and calcination temperatures. The increase in the surface acidity was found to occur with increasing the thermal treatment up to 450 °C, while further increasing of calcination temperature is accompanied by a decrease in the surface acidity. Lewis and Bronsted acid sites play important role in the catalytic activity, The SA-Sn nanoparticles are efficient for the synthesis of 14-aryl-14H-dibenzo[a,j] xanthene under solvent-free conditions in good to excellent yields and the sample contains 25 wt% SA has the highest activity than the others under the same reaction conditions.
Sulfated Tin Oxide as Highly Selective Catalyst for the Chlorination of Methane to Methyl Chloride
Kim, Youngmin,Kim, Jip,Kim, Hyun Woo,Kim, Tae-Wan,Kim, Hyung Ju,Chang, Hyunju,Park, Min Bum,Chae, Ho-Jeong
, p. 9398 - 9410 (2019)
The chlorination of methane (CH4) is an attractive route to convert CH4 into more valuable chemicals. The selective formation of methyl chloride (CH3Cl) is a key process, but it is rather difficult to achieve with high selectivity due to a radical reaction. Catalytic ionic processes can be a solution. Herein, sulfated tin oxide (STO) was employed in the gas-phase catalytic chlorination of CH4. The STO catalyst exhibited high selectivity to CH3Cl (>96%) even at high CH4 conversion. By applying a suite of physicochemical characterizations, it is shown that the strong Lewis acid sites on STO generated by the interaction of Sn and surface sulfate groups are mainly responsible for the highly selective CH4 conversion. DFT calculations further revealed that STO surface can activate more Cl2 molecules in a heterolytic manner, leading to better catalytic performances as compared to SnO2 and sulfated zirconia catalysts.
Preparation and characterization of CO-tolerant Pt and Pd anodes modified with SnO2 nanoparticles for PEFC
Takeguchi, Tatsuya,Anzai, Yuri,Kikuchi, Ryuji,Eguchi, Koichi,Ueda, Wataru
, p. B1132-B1137 (2007)
The PdC and PtC anodes modified with SnO2 nanoparticles for the polymer electrolyte fuel cell (PEFC) were investigated using pure and 500 ppm CO -contaminated H2 as fuel gas. Modification of the PdC anode with SnO2 nanoparticles enhanced the cell performance in pure H2, while modification of the PtC anode a little lowered the performance. The effect of SnO2 addition on the performances of the cell with the Pd anode in CO -contaminated H2 was examined. The cell voltage with the Pd SnO2 C anode in 500 ppm CO -contaminated H2 was 0.41 V at a current density of 0.2 A cm2, while that in pure H2 was 0.59 V. The Pd SnO2 C anode exhibited good tolerance to CO poisoning, since the anode adsorbed CO more weakly. Neither electrochemical oxidation of CO nor shift reaction contributed to the CO tolerance of the Pd SnO2 C anode.
A novel BiVO3/SnO2step S-scheme nano-heterojunction for an enhanced visible light photocatalytic degradation of amaranth dye and hydrogen production
Abd-Rabboh, Hisham S. M.,Ahmed, M. A.,Aziz, Rafi Abdel,Galal, A. H.
, p. 29507 - 29518 (2021/10/08)
The destruction of toxic pollutants and production of hydrogen gas on the surface of semiconductors under light irradiation is the main significance of photocatalysis. Heterojunctions with matching in band gap energy are urgently required for enhancing the redox power of the charge carriers. A step S-scheme BiVO3/SnO2nano-heterojunction was carefully synthesized for a successful photodegradation of amaranth dye and photocatalytic hydrogen evolution. Tetragonal SnO2nanoparticles of 80 m2g?1surface area and distinct mesoporous structure were fabricated by a sol-gel route in the presence of Tween-80 as the pore structure directing agent. BiVO3nanoparticles were deposited homogeneously on the SnO2surface in an ultrasonic bath of power intensity 300 W. The photocatalytic efficiency in the destruction of amaranth dye soar with increasing BiVO3contents of up to 10 wt%. The hydrogen evolution rate reached 8.2 mmol g?1h?1, which is eight times stronger than that of pristine SnO2. The sonicated nanocomposites were investigated by XRD, BET, FESEM, HRTEM, EDS, DRS and PL techniques. The step S-scheme heterojunction with superior oxidative and reductive power is the primary key for the exceptional photocatalytic process. The PL of terephthalic acid and the scavenger trapping experiments reveal the charge migration through the step S-scheme mechanism rather than the type (II) heterojunction mechanism.
Co3Sn2/SnO2 nanocomposite loaded on Cu foam as high-performance three-dimensional anode for lithium-ion batteries
Zhang, Duo,Bi, Chaoqi,Wu, Qingliu,Hou, Guangya,Zheng, Guoqu,Wen, Ming,Tang, Yiping
, p. 1238 - 1246 (2019/01/21)
It is a challenge to commercialize tin dioxide-based anodes for lithium-ion batteries due to their low rate capability and poor cycling performance of the electrodes. Herein, we synthesized a three-dimensional Co3Sn2/SnO2 nanocomposite on copper foam (3D-CS@CF) via a simple method followed by calcination, and employed it as an anode for lithium-ion batteries. The experimental results reveal that the Co3Sn2 and SnO2 nanoparticles were uniformly loaded on the copper skeleton, and the 3D-CS@CF nanocomposite possessed a cross-linked 3D network. As a binder- and conductive-free anode for LIBs, 3D Co3Sn2/SnO2 exhibited good electrochemical performance with a high reversible capacity of 1010.5 mA h g-1 at a current density of 250 mA g-1 after 100 cycles. The extraordinary performance can be ascribed to the unique 3D architecture of the 3D-CS@CF, which inhibits aggregation and accommodates volume expansion, providing a path for the fast ionic diffusion and electron transport. The positive synergistic effect of Co3Sn2 and SnO2 nanoparticles also benefits the electrochemical reaction process.
