【摘 要】
：
The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or Kβ wit
【出 处】
：
Chinese Chemical Letters
论文部分内容阅读
The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or Kβ with alkali-metal bromides and alkali-metal oxides have been investigated comparatively. The alkali-metal bromides promoted substrates are more effective than the alkali-metal oxides promoted systems. Moreover, the NaBr promoted systems are more active than KBr promoted systems. The most effective catalytic system (8wt%NaBr)/KZSM-5 gave a toluene conversion as high as 76.3% and a total C_8 selectivity of 76.4% (styrene/ethylbenzene=9.76) resulting in a total C_8 yield of 58.3%.
The catalytic effects for the oxidative methylation of toluene with methane over the basic zeolite catalysts prepared by promoting KY, KX, KM, KZSM-5 or Kβ with alkali-metal bromides and alkali-metal oxides have been investigated comparatively. The alkali-metal bromides The most effective catalytic system (8 wt% NaBr) / KZSM-5 gave a toluene conversion as high as 76.3 % and a total C_8 selectivity of 76.4% (styrene / ethylbenzene = 9.76) resulted in a total C_8 yield of 58.3%.
其他文献
本文叙述了新发现的有关五大连池老黑山、火烧山两座近代火山喷发过程的清代满文史料档案的主要内容．在此基础上讨论了火山喷发过程及有关问题，同时评议了这些史料的学术价值。
初步研究了西昆仑造山带广泛发育的一组ＮＷ—ＮＷＷ向拉伸线理的矿物组成、产状、分布层位等特征，探讨了其成因。认为该组线理为区内第三主变形期的“陆内榨挤”阶段导致西昆仑造山带逆
A new triterpenoid glycoside 1, 1b, 2a, 3a, 19a-tetrahydroxyurs-12-en-28-oic acid b-D glucopyranosyl ester was isolated from Dichotomanthes tristaniaecarpa. Th
Gnetuhainin P, a new isorhapontigenin dimer, was isolated from the Lianas of Gnetum hainanense C. Y. Cheng. Its structure was established on the basis of spectr
用同步辐射角分辨偏振紫外光电子谱对K/Ru( 10 10 )面上吸附的CO分子轨道的对称性测量发现 :结合能在 11.2eV的CO - 4a1( 4σ)分子轨道对s偏振光 (在沿〈12 10〉的入射面 )是
Key factors for capillary electrophoresis of amino acids with indirect ultraviolet detection were investigated. Buffer compositions and additives were found to
结节性硬化症１例误诊分析新民市人民医院儿科（１１０３００）赵露结节性硬化症是一种较少见的先天性家族遗传性疾病，临床上以癫痫发作、智力减退和面部皮脂腺瘤为其三大特征。我科于１９９４年１２月收治１例
概括了1,3-双烯类单体环聚反应的研究及发展状况,总结了1,3-双烯类单体环聚反应的机理。
The research and development status of 1,3-diene monomer cyclopolymerization
以兰州石油机械研究所与原苏联合作研制的、适用于涡轮或螺杆钻具转速条件下的８１／２ＸＭＰ＿２型高速三牙轮钻头在矿场试验中出现的问题为依据，提出了今后在设计与动力钻具配套使用的高速三牙
为探讨ＮｄＹＡＧ激光治疗高度瞳孔残膜（ＰＰＭｓ）的手术方法，评价ＮｄＹＡＧ激光治疗ＰＰＭｓ的手术效果，我们应用ＮｄＹＡＧ激光对５例儿童（７只眼）伴明显视力障碍的高度瞳孔残膜行上方２７０°范围切断。术后眼部出血、色素播散及眼压升高