全文获取类型
收费全文 | 990篇 |
免费 | 83篇 |
国内免费 | 912篇 |
专业分类
化学 | 1879篇 |
晶体学 | 28篇 |
力学 | 6篇 |
综合类 | 11篇 |
物理学 | 61篇 |
出版年
2024年 | 3篇 |
2023年 | 10篇 |
2022年 | 29篇 |
2021年 | 47篇 |
2020年 | 55篇 |
2019年 | 45篇 |
2018年 | 57篇 |
2017年 | 43篇 |
2016年 | 64篇 |
2015年 | 49篇 |
2014年 | 43篇 |
2013年 | 88篇 |
2012年 | 88篇 |
2011年 | 66篇 |
2010年 | 60篇 |
2009年 | 70篇 |
2008年 | 79篇 |
2007年 | 65篇 |
2006年 | 90篇 |
2005年 | 88篇 |
2004年 | 92篇 |
2003年 | 89篇 |
2002年 | 69篇 |
2001年 | 71篇 |
2000年 | 65篇 |
1999年 | 64篇 |
1998年 | 62篇 |
1997年 | 69篇 |
1996年 | 53篇 |
1995年 | 55篇 |
1994年 | 47篇 |
1993年 | 47篇 |
1992年 | 22篇 |
1991年 | 6篇 |
1990年 | 11篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1983年 | 2篇 |
1959年 | 1篇 |
排序方式: 共有1985条查询结果,搜索用时 546 毫秒
41.
Takao Masuda 《Catalysis Surveys from Asia》2003,7(2-3):133-144
The diffusion mechanisms within zeolite catalysts, such as resistance to diffusion at pore mouths, configurational diffusion, adsorption-controlled diffusion, influence of co-existing molecules and pore blocking, were overviewed. Two kinds of diffusivities, the intracrystalline diffusivity and the effective diffusivity, were discussed separately to clarify the diffusion mechanism. 相似文献
42.
合成异丙苯二次失活FX-01催化剂烧炭再生研究 总被引:4,自引:3,他引:4
以工业合成异丙苯二次失活催化剂为研究对象,考察了二次失活催化剂在不同温度下再生前后酸种类及其比例、酸含量、晶相、孔结构等性能,并分析了失活催化剂结炭性质及不同温度烧炭再生情况。结果表明:温度大于450℃才能烧炭,500℃可将炭烧除78%,600℃方可将炭烧净。500~600℃烧炭后催化剂酸种类及其比例可完全恢复,酸量可恢复80~99%,晶相、孔结构基本未改变,本征活性恢复66~85%。与一次轻度结炭FX01催化剂相比,要提高烧炭温度。 相似文献
43.
应用付里叶变换远红外光谱(FT-FIR)方法研究了NH^+4交换、Na^+反交换和不同水蒸汽处理条件对NaY分子筛骨架外阳离子的影响。结果表明,在NH^+4、Na^+阳离子交换过程中,六方柱笼中Ⅰ位竞争激烈,积极参与交换。骨架外阳离子受影响较大,升温过程中分子筛空穴的吸附水被除去的同时阳离子发生了重新分布。较高温度下分子筛发生脱结构羟基,生成多种形式的铝阳离子。 相似文献
44.
Summary Multipulse experiments reveal qualitative and quantitative, time-resolved information about the interaction of N2O with ZSM-5 type zeolites under conditions of catalytic applications, like the mechanism of N2O decomposition, amount and reactivity of an atomic surface oxygen species. 相似文献
45.
本文用水热法在SiO_2-FeNH_4(SO_4)_2-MTEACl-NaOH-H_2O体系内合成出了用铁全部取代铝的Fe-Si-ZSM-12型沸石分子筛。实验结果表明,Na_2O/SiO_2、MTEA~+/SiO_2和SiO_2/Fe_2O_3比对分子筛的形成和结晶度有很大影响,Fe-Si-ZSM-12的晶化速度比较缓慢,延长晶化时间则容易转化为α-SiO_2。Fe-Si-ZSM-12的X射线衍射谱图与Al-Si-ZSM-12的基本相同,吸附数据表明,其孔径略大于Al-Si-ZSM-12的孔径,热稳定性则劣于Al-Si-ZSM-12的热稳定性。 相似文献
46.
We have been studying the problem of heterogeneity of OH groups in zeolites HY for a long time. The heterogeneity was suggested by the shift of the IR band of OH groups restoring upon ammonia desorption and also by the fact that the band of OH groups forming hydrogen bonds was relatively broad (broader than for homogeneous acidic OH). In the present study we present another important argument for heterogeneity: the splitting of the IR band of free OH and OD groups in a zeolite of Si/Al=8.3 dealuminated by (NH4)2SiF6 treatment. Such a splitting is the best seen in low temperature spectra of OD groups. We found less acidic 3640 cm−1 (AlO)(SiO)2SiO1HAl(OSi)3 and more acidic 3625 cm−1 (SiO)3SiO1HAl(OSi)3 groups. The presence of these two kinds of hydroxyls corresponds to the presence of Si(2Al) and Si(1Al), respectively, detected in 29Si MAS NMR spectra. We also found a small amount of strongly acidic 3599 cm−1 hydroxyls interacting with extraframework Al species. 相似文献
47.
48.
Tin dioxide nanoparticles of 5 nm in size were prepared on NaY zeolite external surface by impregnation of SnCl2 solution and subsequent calcination at 623 K. A SnO2-NaY based chemical sensor for detecting H2 was demonstrated. 相似文献
49.
Processes for the production of xylenes, which occur in an integrated aromatic complex, are discussed. A brief overview of the work carried out at Indian Petrochemicals Corporation Limited for the development of zeolite-based catalytic processes for the production of aromatics is presented. This includes xylene isomerization, transalkylation and disproportionation of C7 and C9 aromatics for maximization of xylenes, selective disproportionation of toluene and selective alkylation of mono-alkylaromatics to p-dialkylbenzene. Achievements in the commercialization of zeolite-based catalysts and processes for isomerization of m-xylene to p- and o-xylene along with dealkylation of ethylbenzene, and for selective ethylation of ethylbenzene to produce p-diethylbenzene are highlighted. 相似文献
50.
Phase-pure and well-intergrown Cu-LTA membranes are developed through copper ions exchange of sodium ions in Na-LTA framework. For pervaporation of 90.0 wt% ethanol/10.0 wt% water mixtures, the Cu-LTA membrane shows much higher water flux than Na-LTA membranes due to the enhancement of the pore size after ions exchange. 相似文献