Effect of ZnO on Cu/ZnO/Al_2O_3 catalysts for methanol synthesis

[中文文摘]用高速碰撞共沉淀法制备m(CuO) /m(ZnO) /m(Al2 O3 )比分别为 60 /3 0 /1 0和 3 0 /60 /1 0的 1 #和 2 #催化剂 ,结果表明高ZnO的 2 #催化剂活性较好 ,分散度较大。XPS测试表明 2 #催化剂表面ZnO吸附的中间体 (CHx 或CHxO)较多且表面的Cu+1浓度较高 ,从而促进CO加氢合成甲醇的活性。[英文文摘]Cu/ZnO/Al_2O_3 catalysts with ratios of 60/30/10 and 30/60/10 have been prepared by high speed collision coprecipitation method. The performance of the catalyst with the higher ZnO content shows the higher activity in methanol synthesis. The characterization results indicated that the catalyst with the higher ZnO content has higher dispersion. On the surface of the higher ZnO content catalyst, there was more Cu+1 and more intermediate (CH_x and CH_xO) adsorpted. It is beneficial for the CO hydrogenating to produce methanol

A giant bladder stone with a small urethral stone

A 71-year-old man had pollakisuria, macrohematuria and sense of urinary retention. His urethrogram showed a giant bladder stone with a small urethral stone. He received cystolithotomy. The giant bladder stone was removed. It weighed 310 g and is the 32nd reported in Japan

木材価格の形成機構に関する研究 : ヒノキ丸太の商品分化

論文(Article)departmental bulletin pape

虎伯寮南亚热带雨林自然保护区的竹类资源及开发利用

福建省南靖县虎伯寮南亚热带雨林自然保护区的竹类资源丰富 ,有 8属 2 0种 3变种 5栽培型 ,其中梅花毛竹 ( Phyllostachys heterocycla cv.obtusangula)为福建竹类新分布 ;主要的竹林类型有毛竹林、麻竹林、绿竹林、石竹林、单竹林。竹类资源的开发利用具有广阔的前

Vegetation of Mangroves: Spatial and Temporal Pattern of its Dominant Populations in Futian National Nature Reserve

The community characteristics of mangroves in the Futian Nature Reserve, Shenzhen, China are given based on surveying of 33 quadrats in 4 transects which stretch from the higher tidal zone to the lower tidal zone. The results show that there are 6 community types in this area: Kandelia candel association, Avicennia marina association, Aegiceras corniculatum association, Kandelia candel + Aegiceras corniculatum association, Aegiceras corniculatum + Kandelia candel association and Acanthus ilicifolius association. Kandelia candel, Aegiceras corniculatum and Avicennia marina dominate the typical quadrats. Kandelia candel can be seen at almost all quadrats, Aegiceras corniculatum distributes mostly toward the estuary and the higher tidal zone, Avicennia marina distributes mostly toward the bay and the lower tidal zone, Bruguiera gymnorrhiza occasionally occurs toward the Estuary with one or several individuals, Acanthus ilicifolius was common toward the higher tidal zone, as an accompanying speci..

深圳福田白骨壤红树林生物量和能量研究

本文探讨了深圳福田红树林保护区５６年生白骨壤群落的生物量、生长量及能量分布。结果表明：该群落现存生物量为１６５８３８８ｇ／ｍ２，其中地上部占６６７８％，地下部占３３２２％。年增长量（１９９３）为１１４９８ｇ／ｍ２。植物体各组分热值含量变化范围在１６１～１８２２ＫＪ／ｇ，其中以树干材热值含量居最高，而中根最低；群落能量现存量为２９１８３９ＫＪ／ｍ２，其中地上部占６８５１％，地下部占３１４９％；群落年增长能量存留量（１９９３）为２０２１３ＫＪ／ｍ２