scholarly journals Coated sulfated zirconia/SAPO-34 for the direct conversion of CO2 to light olefins

2020 ◽  
Vol 10 (5) ◽  
pp. 1507-1517 ◽  
Author(s):  
Adrian Ramirez ◽  
Abhishek Dutta Chowdhury ◽  
Mustafa Caglayan ◽  
Alberto Rodriguez-Gomez ◽  
Nimer Wehbe ◽  
...  
Keyword(s):  
Carbon Cycle ◽  
Metal Oxides ◽  
Sulfated Zirconia ◽  
Fossil Fuel ◽  
Direct Conversion ◽  
Light Olefins ◽  
Bifunctional Catalysts

The conversion of CO2 to light olefins via bifunctional catalysts (i.e. metal oxides/zeolites) is a promising approach to tackle CO2 emissions and, at the same time, reduce fossil-fuel dependence by closing the carbon cycle.

A Mechanistic Study of Syngas to Light Olefins over OXZEO Bifunctional Catalysts: Insights into the Initial Carbon-Carbon Bond Formation on the Oxide

2022 ◽  
Author(s):  
Hongyu Chen ◽  
Zhengmao Liu ◽  
Na Li ◽  
Feng Jiao ◽  
Yuxiang Chen ◽  
...  
Keyword(s):  
Bond Formation ◽  
Direct Conversion ◽  
Bifunctional Catalyst ◽  
Light Olefins ◽  
Mechanistic Study ◽  
Bifunctional Catalysts ◽  
Reaction Intermediates ◽  
Carbon Bond ◽  
Carbon Carbon Bond ◽  
Initial Carbon

Direct conversion of syngas into light olefins (C2=-C4=) using bifunctional catalyst composed of oxide and zeolite (OXZEO) has attracted extensive attention in both academia and industry. However, the reaction intermediates...

scholarly journals Utilization of SAPO-18 or SAPO-35 in the bifunctional catalyst for the direct conversion of syngas to light olefins

RSC Advances ◽  
2021 ◽  
Vol 11 (23) ◽  
pp. 13876-13884
Author(s):  
Yuxuan Huang ◽  
Hongfang Ma ◽  
Zhiqiang Xu ◽  
Weixin Qian ◽  
Haitao Zhang ◽  
...  
Keyword(s):  
Direct Conversion ◽  
Bifunctional Catalyst ◽  
Light Olefins

SAPO-18 and SAPO-35 were synthesized and utilized as the zeotype in the bifunctional catalyst for the STO process, respectively.

scholarly journals Multicentury Changes to the Global Climate and Carbon Cycle: Results from a Coupled Climate and Carbon Cycle Model

2005 ◽  
Vol 18 (21) ◽  
pp. 4531-4544 ◽  
Author(s):  
G. Bala ◽  
K. Caldeira ◽  
A. Mirin ◽  
M. Wickett ◽  
C. Delire
Keyword(s):  
Carbon Cycle ◽  
Radiative Forcing ◽  
Fossil Fuel ◽  
Global Climate ◽  
Second Century ◽  
Cycle Model ◽  
Carbon Cycle Model ◽  
Living Biomass ◽  
Long Term Consequences

Abstract A coupled climate and carbon (CO2) cycle model is used to investigate the global climate and carbon cycle changes out to the year 2300 that would occur if CO2 emissions from all the currently estimated fossil fuel resources were released to the atmosphere. By the year 2300, the global climate warms by about 8 K and atmospheric CO2 reaches 1423 ppmv. The warming is higher than anticipated because the sensitivity to radiative forcing increases as the simulation progresses. In this simulation, the rate of emissions peaks at over 30 Pg C yr−1 early in the twenty-second century. Even at the year 2300, nearly 50% of cumulative emissions remain in the atmosphere. Both soils and living biomass are net carbon sinks throughout the simulation. Despite having relatively low climate sensitivity and strong carbon uptake by the land biosphere, these model projections suggest severe long-term consequences for global climate if all the fossil fuel carbon is ultimately released into the atmosphere.

scholarly journals Current systematic carbon-cycle observations and the need for implementing a policy-relevant carbon observing system

2014 ◽  
Vol 11 (13) ◽  
pp. 3547-3602 ◽  
Author(s):  
P. Ciais ◽  
A. J. Dolman ◽  
A. Bombelli ◽  
R. Duren ◽  
A. Peregon ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Carbon Cycle ◽  
Fossil Fuel ◽  
The Arctic ◽  
Observation System ◽  
Observation Data ◽  
Current State ◽  
Spatial Coverage

Abstract. A globally integrated carbon observation and analysis system is needed to improve the fundamental understanding of the global carbon cycle, to improve our ability to project future changes, and to verify the effectiveness of policies aiming to reduce greenhouse gas emissions and increase carbon sequestration. Building an integrated carbon observation system requires transformational advances from the existing sparse, exploratory framework towards a dense, robust, and sustained system in all components: anthropogenic emissions, the atmosphere, the ocean, and the terrestrial biosphere. The paper is addressed to scientists, policymakers, and funding agencies who need to have a global picture of the current state of the (diverse) carbon observations. We identify the current state of carbon observations, and the needs and notional requirements for a global integrated carbon observation system that can be built in the next decade. A key conclusion is the substantial expansion of the ground-based observation networks required to reach the high spatial resolution for CO2 and CH4 fluxes, and for carbon stocks for addressing policy-relevant objectives, and attributing flux changes to underlying processes in each region. In order to establish flux and stock diagnostics over areas such as the southern oceans, tropical forests, and the Arctic, in situ observations will have to be complemented with remote-sensing measurements. Remote sensing offers the advantage of dense spatial coverage and frequent revisit. A key challenge is to bring remote-sensing measurements to a level of long-term consistency and accuracy so that they can be efficiently combined in models to reduce uncertainties, in synergy with ground-based data. Bringing tight observational constraints on fossil fuel and land use change emissions will be the biggest challenge for deployment of a policy-relevant integrated carbon observation system. This will require in situ and remotely sensed data at much higher resolution and density than currently achieved for natural fluxes, although over a small land area (cities, industrial sites, power plants), as well as the inclusion of fossil fuel CO2 proxy measurements such as radiocarbon in CO2 and carbon-fuel combustion tracers. Additionally, a policy-relevant carbon monitoring system should also provide mechanisms for reconciling regional top-down (atmosphere-based) and bottom-up (surface-based) flux estimates across the range of spatial and temporal scales relevant to mitigation policies. In addition, uncertainties for each observation data-stream should be assessed. The success of the system will rely on long-term commitments to monitoring, on improved international collaboration to fill gaps in the current observations, on sustained efforts to improve access to the different data streams and make databases interoperable, and on the calibration of each component of the system to agreed-upon international scales.

Sign in / Sign up

Export Citation Format

Share Document