Jishuan Suo

Catalytic decomposition of N2O over MxCo1−xCo2O4 (M = Ni, Mg) spinel oxides

Abstract The catalytic decomposition of N 2 O to N 2 and O 2 was carried out on the M x Co 1− x Co 2 O 4 (M=Ni 2+ and Mg 2+ , x =0.0–0.99) spinel catalysts. The results showed that the partial replacement of Co 2+ by Ni 2+ or Mg 2+ in Co 3 O 4 spinel oxide led to a significant improvement in the catalytic activity for the N 2 O decomposition, and the catalytic activity depended on the degree of Co 2+ substitution by Ni 2+ or Mg 2+ . The conversion of N 2 O reached 100% over the Ni 0.74 Co 0.26 Co 2 O 4 and Mg 0.54 Co 0.46 Co 2 O 4 catalysts at 200xa0°C and 300xa0°C in the absence and presence of excess O 2 and water steam, respectively.

Excellent catalytic performance of ZnxCo1−xCo2O4 spinel catalysts for the decomposition of nitrous oxide

Abstract The catalytic decomposition of N2O to N2 and O2 was carried out on the ZnxCo1−xCo2O4 (x=0.0–0.98) spinel catalysts. The results showed that the partial replacement of Co2+ by Zn2+ in Co3O4 spinel oxide led to a significant improvement in the catalytic activity for the N2O decomposition, and the catalytic activity depended on the degree of Co2+ substitution by Zn2+. The Zn0.36Co0.64Co2O4 catalyst is the most active in the studied samples. The conversion of N2O reached 100% over the Zn0.36Co0.64Co2O4 catalyst at 200 and 300 °C in the absence and presence of excess O2 and water, respectively.

Hydroxylation of phenol catalyzed by copper Keggin-type heteropoly compounds with hydrogen peroxide

A novel catalytic process for the oxidation of phenol to dihydroxybenzene with hydrogen peroxide was developed in which copper–12-silicotungstic acid was used as catalyst in aqueous solution. The maximal conversion of phenol is ca. 39%, which is much higher than the results in acetonitrile reported previously.

Novel efficient synthesis of glycol monoethers over a niobium-containing MCM-41 mesoporous molecular sieve

A n niobium-containing MCM-41 mesoporous molecular sieve was synthesized n by the hydrolysis of tetraethylorthosilicate and niobium n pentachloride, using cetylpyridinium bromide as template in acidic n medium, and was found to be highly active in n the direct conversion of cyclohexene into trans-2-alkoxycyclohexanol n at mild temperature in the presence of H2O2 and alcohol.

Synthesis of periodic mesoporous organosilicas via the “S+X−I+” route

Abstract Periodic mesoporous organosilicas (PMOs) were synthesized using bridged silsesquioxane 1,2-bis(triethoxysilyl)ethane as the precursor and cetylpyridinium bromide as the structure-directing species via the “S+X−I+” route. The products were characterized by means of N2 adsorption, SEM, TEM, and FT-IR spectroscopy. Mesoporous phases with worm-like channels as well as uniform pores can be prepared via the “S+X−I+” route. The FT-IR analysis revealed that the ethane group remains intact in the channels of the PMOs and that the surfactant can be easily removed by solvent extraction. The synthesis conditions such as the concentration of surfactant, pH, and temperature were studied systematically.

Catalytic monoepoxidation of butadiene over titanium silicate molecular sieves TS‐1

Titanium silicate molecular sieves TS‐1 have been prepared under hydrothermal conditions with tetrapropylammonium hydroxide as structure‐directing agent. The structures of TS‐1 were characterized by means of XRD, TEM, FT‐IR, DR UV‐Vis, ICP‐AES, and N2 adsorption/desorption techniques. Its catalytic performances in the epoxidation of butadiene with hydrogen peroxide were investigated; 3,4‐epoxy‐1‐butene was obtained with high selectivity. The influences of various parameters such as temperature, solvent, and titanium content on the activities of the catalysts were studied systematically.

Superior performance of nano-Au supported over Co3O4 catalyst in direct N2O decomposition

Au nanoparticles supported over Co3O4 lead to a highly active and stable catalyst for N2O decomposition even in the presence of excess oxygen and steam.

Synthesis of mesoporous silica molecular sieves via a novel templating scheme

A novel templating scheme was demonstrated for the synthesis of mesoporous silica molecular sieve under mild conditions in which N, N-dimethyldodecylamine oxide was in situ prepared from its precursors and used directly as the structure-directing agent. X-ray diffraction and transmission electron micrography revealed that samples thus obtained exhibited a large number of worm-like and interconnected channels, but lack of long range packing order, that is the structure was disordered. Nitrogen adsorption/desorption isotherms confirmed that the pore diameter was in the range of mesoporous region and the sample bore extremely high specific surface areas (>1000m2/g). The structure of the mesoporous silica molecular sieve was determined by various synthesis parameters (especially, pH and surfactant to silica ratio of the gel).

Assembly of nanoporous silica via amphoteric surfactant templating scheme

Abstract Nanoporous silica was prepared using a cheap and biodegradable surfactant —amphoteric tetradecyl betaine (C 14 H 29 N + CH 3 ) 2 CH 2 COO) (TB) as the structure directig agent and tetraethylorthosilcate (TEOS) as silica source under hydrothermal conditions.. Physical characterization by means of powder X-ray diffraction (XRD), nitrogen adsorption/desorption, and thermogravimetry (TG) provided evidences that mesoporous molecular sieve structure was formed in the as-synthesized composites and well-preserved after calcination in air at 973K for 6h. Furthermore, nearly 100% surfactant removal was achieved by direct solvent extraction, where ethanol and water mixture (1/1 V/V) was used as extractive agent.