نتایج جستجو برای: mcm 41 supported catalyst
تعداد نتایج: 324330 فیلتر نتایج به سال:
Citronellal can be cyclised to produce isopulegol, which is an intermediate in the synthesis of menthols. These chemicals are all used in the fragrance industry and menthol is also an important product used as a flavour, a pharmaceutical and in oral care. The cyclisation of citronellal proceeds readily with various homogeneous catalysts, but the catalyst frequently cannot be recovered and reuse...
The catalytic cracking of a fuel oil over fluid catalytic cracking (FCC) catalyst has been investigated applying different additives. Catalyst mixtures consisting of a equilibrium FCC catalyst (E-Cat) blended with ZSM-5, MCM-41 and Mordenite additives were examined at the additive levels of 25 wt.%. The catalytic performance of the matrix was studied in a fixed bed micro-activity test unit (MAT...
Hoveyda-Grubbs type catalysts with cationic tags on NHC ligands were linker-free immobilized on the surface of lamellar zeolitic supports (MCM-22, MCM-56, MCM-36) and on mesoporous molecular sieves SBA-15. The activity of prepared hybrid catalysts was tested in olefin metathesis reactions: the activity in ring-closing metathesis of citronellene and N,N-diallyltrifluoroacetamide decreased in the...
The activity of Ni supported on mesoporous SBA-15, MCM-41, KIT-6, and a sol-gel prepared Ni/γAl2O3, for catalysing methane dry reforming was investigated. The chemical and physical characteristics of the catalysts before and after catalytic testing were investigated using X-Ray diffraction, X-ray Photoemission Spectroscopy, Transmission Electron Microscopy, Scanning Electron Microscopy / Energy...
In this work single walled carbon nanotubes (SWNT) have been synthesized by high pressure CO disproportionation using cobalt grafted on MCM-41 by means of grafting method employing cobalt (II) acetylacetonate. The reduction temperature of the metal species of these catalysts and their physical properties characterized by XRD, nitrogen physisoption and temperature reduction programmed are compar...
امروزه ترکیبات آلاینده آلی بهوسیله فعالیت های انسانی، از راه های متفاوتی تولید می شوند. این آلایندهها بهدلیل ویژگی های جهشزایی، سرطانزایی و سمیت بالایی که دارند برای محیط زیست و موجودات زنده خطرناک هستند. این مواد نسبتاً فرارند و نیمه عمر طولانی دارند لذا تخریب و از بین بردن آلاینده های آلی بهروش هایی که برای محیط زیست مضر نباشد، مهم است. با توجه به کاربرد گسترده زئولیتها در جذب آلاینده...
نانوکامپوزیت های پلی استیرن/mcm–41 به روش پلیمرشدن رادیکالی انتقال اتم (atrp) در دمای 110 درجه سلسیوس سنتز شدند. روش های آغاز فعال کننده هایی که با انتقال الکترون تولید می شوند (aget) و فعال کننده هایی که با انتقال الکترون بازتولید می شوند (arget) به عنوان دو روش نوین آغاز در atrp به کار گرفته شدند. ساختار ویژه، مساحت سطح، اندازه ذرات و توزیع آنها و ساختار اسفنجی و حفره ای نانوذرات mcm–41 سنت...
bamboo-structured carbon nanotubes are grown on co-mo/mcm-41 catalyst in the temperature range of 873-973 k by thermal chemical vapor deposition of acetylene. this study shows that the purified carbon nanotubes have open tips and the metals of the catalyst are not encapsulated. thus, the bamboo-structure seems to grow from the base. pore size distribution of the product is quite narrow and is i...
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