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A poly(styryl)bypyridine-titanium tetrachloride complex catalyst
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A Poly(styryl)bipyridine-Titanium Tetrachloride Complex Catalyst The preparation of the catalyst of the title (see Acta Scientiarum Naturalium, Universita tis Pekinensis (Chinese), 24(2)(1988)143) involved in the synthesis of beads of poly(styryl)bipyridine cross-linked with 4% of divinylbenzene, followed by combination of the resultant beads with TiCI4 in chloroform to form a n-d-bonding complex which contained 12.4% of chlorine, corresponding to 8.7~10~~ mol TiCI4 per gram of complex beads. This complex was claimed to be efficient for the catalysis of a number of organic reactions to give high yield, such as esterification, acetalization, ketal formation, etherification and Friedel-Crafts alkylation. The complex catalyst was stable in air for at least one year and could be reused.
A New Catalyst for Gas-Phase OneStep Condensation of Formaldehyde and lsobutylene An investigation of the above catalyst by the Lanzhou Institute of Chemical Physics in China has been described in the Chinese Journal of Petrochemical Technology (8(1988)483). The said catalyst was made of a support of spherical SiOn and an active component of CuxBiyOz. It was found that the copper loading level had less effect on the activity of the catalyst, if the atom ratio of copper-to-silicon was lower than 0.03. A significant decrease in activity, resulting from the formation of the bulk CuO, was observed when the copper-to-silicon ratio was above 0.03. The preferable calcination temperatures of the catalyst were 350 to 45O’C and the suitable reaction condi-
tions were: temperature 280-300°C, reaction period 50 min, contact time 0.5 0.6 s, mol ratio of isobutylene toformaldehyde 6.0-6.7. A 62 mol-% yield of isopropene and 84% conversion of formaldehyde were obtained on the catalyst withtheformulation of Cuo.s;lBir.&iloo.
Synthesis of Large Single Crystals of Ti-ZSM-5 and B-ZSM-5 An article in the Chemical Journal of Chinese University (9( 12) (1988) 1287) by Qiu Shilun of the Institute of Synthetic and Catalytic Chemistry, Jilin University in China introduced work on the synthesis of the materials mentioned in the title, called titanozeosilite and borozeosilite in non-alkaline medium in the presence of fluoride. For synthesis of B-EM-5 a mixture of the starting materials including white carbon black, Al2(SO4)slBH2O, (NH&+ Ti(02)Fs (self-synthesized) and template TPA Br was crystallized at 16019O’Cfor 6-l 5 days. The single crystals obtained were larger than 110 km in length. The mechanism of the ctystallization for the single crystals was investigated in the systems of SiO2-TiOs(TPA)zO-NHdF-H20.
Porous NVAl.203 Catalyst Plate for decomposition and Partial Oxidation of Ammonia This catalyst developed by the Chungdu Institute of Organic Chemistry in China consisted of a support of porous alumina (CI and q-phase), with 29x10 mm in size, a surface area of 36.8 m2/g and an average pore radius of 16.7 nm, and of 17% NiO. It is claimed that for NH3 decomposition, it gave an NH3 conversion of more than 99.5% at 75O’C and a space velocity of 10 OOO40 000 h-l. The Ha/N2 gas mixture pro-
applied catalysis - Volume 50 No. 1 - May 1, 1989
A Poly(styryl)bipyridine-Titanium Tetrachloride Complex Catalyst The preparation of the catalyst of the title (see Acta Scientiarum Naturalium, Universita tis Pekinensis (Chinese), 24(2)(1988)143) involved in the synthesis of beads of poly(styryl)bipyridine cross-linked with 4% of divinylbenzene, followed by combination of the resultant beads with TiCI4 in chloroform to form a n-d-bonding complex which contained 12.4% of chlorine, corresponding to 8.7~10~~ mol TiCI4 per gram of complex beads. This complex was claimed to be efficient for the catalysis of a number of organic reactions to give high yield, such as esterification, acetalization, ketal formation, etherification and Friedel-Crafts alkylation. The complex catalyst was stable in air for at least one year and could be reused.
A New Catalyst for Gas-Phase OneStep Condensation of Formaldehyde and lsobutylene An investigation of the above catalyst by the Lanzhou Institute of Chemical Physics in China has been described in the Chinese Journal of Petrochemical Technology (8(1988)483). The said catalyst was made of a support of spherical SiOn and an active component of CuxBiyOz. It was found that the copper loading level had less effect on the activity of the catalyst, if the atom ratio of copper-to-silicon was lower than 0.03. A significant decrease in activity, resulting from the formation of the bulk CuO, was observed when the copper-to-silicon ratio was above 0.03. The preferable calcination temperatures of the catalyst were 350 to 45O’C and the suitable reaction condi-
tions were: temperature 280-300°C, reaction period 50 min, contact time 0.5 0.6 s, mol ratio of isobutylene toformaldehyde 6.0-6.7. A 62 mol-% yield of isopropene and 84% conversion of formaldehyde were obtained on the catalyst withtheformulation of Cuo.s;lBir.&iloo.
Synthesis of Large Single Crystals of Ti-ZSM-5 and B-ZSM-5 An article in the Chemical Journal of Chinese University (9( 12) (1988) 1287) by Qiu Shilun of the Institute of Synthetic and Catalytic Chemistry, Jilin University in China introduced work on the synthesis of the materials mentioned in the title, called titanozeosilite and borozeosilite in non-alkaline medium in the presence of fluoride. For synthesis of B-EM-5 a mixture of the starting materials including white carbon black, Al2(SO4)slBH2O, (NH&+ Ti(02)Fs (self-synthesized) and template TPA Br was crystallized at 16019O’Cfor 6-l 5 days. The single crystals obtained were larger than 110 km in length. The mechanism of the ctystallization for the single crystals was investigated in the systems of SiO2-TiOs(TPA)zO-NHdF-H20.
Porous NVAl.203 Catalyst Plate for decomposition and Partial Oxidation of Ammonia This catalyst developed by the Chungdu Institute of Organic Chemistry in China consisted of a support of porous alumina (CI and q-phase), with 29x10 mm in size, a surface area of 36.8 m2/g and an average pore radius of 16.7 nm, and of 17% NiO. It is claimed that for NH3 decomposition, it gave an NH3 conversion of more than 99.5% at 75O’C and a space velocity of 10 OOO40 000 h-l. The Ha/N2 gas mixture pro-
applied catalysis - Volume 50 No. 1 - May 1, 1989