Alkali promotion effects on CO2 sorption have been characterised by a series of complementary analytical techniques on γ-alumina, magnesia, hydrotalcites and alkaline promoted corresponding materials under conditions representative for WGS conditions. Alkaline carbonates are destabilised when interacting with solid surface as evidenced by thermogravimetric analyses and temperature programmed de...

The thick sequences of layered deposits found in the Valles Marineris have recently been determined by S.S. Nedell, S.W. Squyres, and D.W. Andersen (1987, Icarus, 70, 409-441) to contain a minimum of approximately 10(5) km3 of material. We suggest that this material could be derived from the precipitation of 30 mbar of atmospheric CO2 as carbonates in lakes. As surface temperatures fell on Ma...

Carbon sequestration by reacting naturally occurring Mg and Ca containing minerals with CO2 to form carbonates has many unique advantages. Most notably is the fact that carbonates have a lower energy state than CO2, which is why mineral carbonation is thermodynamically favorable and occurs naturally (e.g., the weathering of rock over geologic time periods). Secondly, the raw materials such as m...

[1] The fate of carbonates in the Earth’s mantle plays a key role in the geodynamical carbon cycle. Although iron is a major component of the Earth’s lower mantle, the stability of Fe-bearing carbonates has rarely been studied. Here we present experimental results on the stability of Fe-rich carbonates at pressures ranging from 40 to 105 GPa and temperatures of 1450–3600 K, corresponding to dep...

The Boehm titration, originally developed to characterize carbon blacks and activated carbons, has earned growing attention as a method for characterization of acid and base properties of biochar (Boehm, 1994; Goertzen et al., 2010). The method is based on the principle that strong acids and bases will react with all bases and acids, respectively, whereas the conjugate bases of weak acids will ...

The potential for using Raman spectroscopy to measure stable oxygen isotope ratios (O/O) in carbonates is evaluated by measuring the Raman spectra and isotope ratios of a suite of 60 synthesized, O-enriched calcite crystals ranging in composition from natural abundance (0.2mole-% O) to 1.2 mole-% O.We determined the Raman-inferred isotopic ratios (RRaman) by fitting curves to the n1 symmetric s...

The highly enantioselective asymmetric allylic alkylation of Morita-Baylis-Hillman carbonates with bis(phenylsulfonyl)methane is presented. The reaction is simply catalyzed by cinchona alkaloid derivatives affording the final alkylated products in good yields and enantioselectivities.

Zn(salphen) complexes are reported as effective, cheap, robust and relatively green catalysts for the cycloaddition of carbon dioxide to terminal epoxides to afford cyclic carbonates in good yields.

Transects of the submersible Alvin across rock outcrops in the Oregon subduction zone have furnished information on the structural and stratigraphic framework of this accretionary complex. Communities of clams and tube worms, and authigenic carbonate mineral precipitates, are associated with venting sites of cool fluids located on a fault-bend anticline at a water depth of 2036 meters. The dist...

Approximately 140 million years ago, the Indian plate separated from Gondwana and migrated by almost 90° latitude to its current location, forming the Himalayan-Tibetan system. Large discrepancies exist in the rate of migration of Indian plate during Phanerozoic. Here we describe a new approach to paleo-latitudinal reconstruction based on simultaneous determination of carbonate formation temper...