Results 211 to 220 of about 587,323 (242)
Aluminum Distribution in Ferrierite Zeolites Influences the Performance of Methane Oxidation
Angewandte Chemie, EarlyView.FER‐type aluminosilicate zeolites with preferential Al occupancy at T4 site favor direct methane‐to‐methanol oxidation, while those with Al concentrated at T3 sites within 10‐ring channels facilitate tandem conversion of methane‐to‐methanol on oxidative sites, followed by methanol‐to‐hydrocarbons on acidic sites.
Peipei Xiao +11 more
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Angewandte Chemie, EarlyView.A metastable cyclodextrin monomer can form kinetically trapped supramolecular polymer at low pH. Raising the pH triggers gradual depolymerization into the self‐included monomer with a rate that can be preset by tuning the pH value. The pH‐dependence is directly associated with the rigidity of the cyclodextrin bridge, which is modulated by protonation ...
Wenting Hu +7 more
wiley +1 more source
Angewandte Chemie, EarlyView.A highly efficient and selective chemo‐divergent hydrogenation of cyclic carbonates is promoted by in situ generated poly(ionic liquid)‐stabilized ruthenium nanoparticles (Ru@PIL) catalysts. Under solvent‐free conditions, ethylene carbonate is transformed into either ethylene glycol and CH4 or EtOH and CO2, following a “direct hydrogenation” or a ...
Wenjuan Wang +2 more
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Angewandte Chemie, EarlyView.Mn/TiO2 is a highly active catalyst for the conversion of methane‐to‐methyl trifluoroacetate using molecular oxygen as an oxidant. Different Mn/TiO₂ catalysts with varying properties demonstrate a correlation between Mn dispersion and reducibility, and catalytic activity. Notably, around 30% yields were obtained, confirming the effectiveness of Mn/TiO2
Andrea N. Blankenship +3 more
wiley +1 more source
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Bioresource Technology, 2018
The on-going annual increase in global methane (CH4) emissions can be largely attributed to anthropogenic activities. However, as more than half of these emissions are diffuse and possess a concentration less than 3% (v/v), physical-chemical treatments are inefficient as an abatement technology.
Helen La +3 more
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The on-going annual increase in global methane (CH4) emissions can be largely attributed to anthropogenic activities. However, as more than half of these emissions are diffuse and possess a concentration less than 3% (v/v), physical-chemical treatments are inefficient as an abatement technology.
Helen La +3 more
openaire +3 more sources
Annual Review of Microbiology, 1977
CONTENTS INTRODUCTION 310 THE ROLE OF METHANOGENIC BACTERIA IN INTERSPECIES H, TRANSFER ...... 310 The Methanogenic Bacterial Interaction 312 Low-molecular-weight end products 312 Carbohydrates 315 The Non-Methanogenic Bacterial Interaction 316 METHANOGENESIS FROM ACETATE 317 Acetate Enrichment 318 Methanol Enrichment 318 Benzoate ...
Larry Baresi +3 more
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CONTENTS INTRODUCTION 310 THE ROLE OF METHANOGENIC BACTERIA IN INTERSPECIES H, TRANSFER ...... 310 The Methanogenic Bacterial Interaction 312 Low-molecular-weight end products 312 Carbohydrates 315 The Non-Methanogenic Bacterial Interaction 316 METHANOGENESIS FROM ACETATE 317 Acetate Enrichment 318 Methanol Enrichment 318 Benzoate ...
Larry Baresi +3 more
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Mechanistic Studies on the Hydroxylation of Methane by Methane Monooxygenase
Chemical Reviews, 2003Methanotrophs are bacteria that live on methane as their only source of carbon.1 The first step in their utilization of this simplest of all hydrocarbons is its selective conversion to methanol. Subsequent biochemical pathways transform methanol to formaldehyde, which in turn is processed into biomass.
Richard A. Friesner +3 more
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Rotational spectra of methane and deuterated methane in helium
The Journal of Chemical Physics, 2010We present calculations of the rotational excitations of CH4 and CD4 in helium using correlated basis function theory for excited states of spherical top molecules, together with ground state helium density distributions computed by diffusion Monte Carlo simulations.
Robert E. Zillich, K. Birgitta Whaley
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Soluble methane monooxygenase: activation of dioxygen and methane
Current Opinion in Chemical Biology, 2002The mechanisms by which soluble methane monooxygenase uses dioxygen to convert methane selectively to methanol have come into sharp focus. Diverse techniques have clarified subtle details about each step in the reaction, from binding and activating dioxygen, to hydroxylation of alkanes and other substrates, to the electron transfer events required to ...
Daniel A. Kopp, Stephen J. Lippard
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Journal of the Air Pollution Control Association, 1967
Methane is present in the troposphere with a volume concentration of about 1.5 ppm. Estimates of Koyama indicate a predominantly biological origin with a total production rate of about 2.7 x 10/sup 14/ g CH/sub 4//yr. From that the author estimated the atmospheric lifetime of methane to be around 20 years.
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Methane is present in the troposphere with a volume concentration of about 1.5 ppm. Estimates of Koyama indicate a predominantly biological origin with a total production rate of about 2.7 x 10/sup 14/ g CH/sub 4//yr. From that the author estimated the atmospheric lifetime of methane to be around 20 years.
openaire +4 more sources